A round balloon of radius r subtends an ...

A round balloon of radius r subtends an angle `alpha` at the eye of the observer while the angle of elevation of its centre is `beta` Prove that the height of the centre of the balloon is `rsinbetacosec[alpha/2]`

`r "cosec "alpha sin beta/2`

`r sin alpha "cosec "beta/2`

`r sin alpha/2 "cosec" beta`

`r "cosec "alpha/2 sin beta`

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